Sagawa, the boss, and Shiina, a new graduate employee, head to the inn where they will stay after a business trip, but they encounter trouble that only one room is reserved. However, Shiina, who likes uncles, deliberately arranged it so that he could stay in the same room as Sagawa. Shiina seduces Sagawa and has an affair with him. Even though Sagawa feels guilty, he is swept away and becomes addicted to it...
